Update with recovered code from VM binaries (Jan 1)

Recovered from decompiled OpenMaui.Controls.Linux.dll:
- SkiaShell.cs: FlyoutHeader, FlyoutFooter, scroll support (918 -> 1325 lines)
- X11Window.cs: Cursor support (XCreateFontCursor, XDefineCursor)
- All handlers with dark mode support
- All services with latest implementations
- LinuxApplication with theme change handling

Services/DisplayServerType.cs

@@ -0,0 +1,8 @@
+namespace Microsoft.Maui.Platform.Linux.Services;
+
+public enum DisplayServerType
+{
+	Auto,
+	X11,
+	Wayland
+}